In plastic bonded magnets, magnet powder made of Neodymium, Samarium Cobalt or Hard Ferrite is mixed with thermoplastics and injected into a mould, or pressed.
By applying magnetic fields in the tool, a preferred direction in the axial, radial or diametrical direction can be applied so that isotropic and anisotropic magnets are possible.
Although the magnetic values are not equal to those of the solid material, there are some advantages to this process.
One of the main advantage of plastic bonded magnets is the enormous variety of shapes. So pinion and other functional parts of the same material can be injected at the same time. Shafts or other components can be inserted by means of extrusion coating. It is also possible to press in shafts afterwards because of the close injection moulding tolerances and the material elasticity.